package chepter10.Demo01;
import  java.sql.*;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.Statement;
import java.util.Scanner;

public class Demo01 {
    /**
     *模拟添加用户业务
     */
    public static void main(String[] args) throws  SQLException{
        /**JDBC连接数据库
         * 1.加载 驱动
         * 2.连接
         * 3.表连接
         * 4.预处理(SQL)
         * 5.结果
         * 6.释放 连接
         */
        /**
         * (1) 加载
         * a.根目录创建lib文件夹
         * b.将 连接jar包放入lib
         * c.点击文件->项目结构->模块->依赖->+号->JAR或目录->选中mysql的jar包
         * d.编写加载代码
         */
        Statement stmt = null;
        ResultSet rs = null;
        Connection conn = null;
        try {
            Class.forName("com.mysql.cj.jdbc.Driver");
            String url = "jdbc:mysql://localhost:3306/jdbc?serverTimezone=GMT%2B8&useSSL=false";
            String username = "root";//数据库账户
            String password = "123456";
            conn = DriverManager.getConnection(url,username,password);
            // 3.通过Connection对象获取Statement对象
            stmt = conn.createStatement();
            //4.使用Statement执行SQL语句
            /**
             * 终端用户输入用户名 密码 邮箱
             * 将终端用户的输入添加到数据库中
             */
            Scanner sc = new Scanner(System.in);
            System.out.println("请输入用户姓名");
            String un = sc.next();
            System.out.println("请输入用户密码");
            String pd = sc.next();
            System.out.println("请输入用户邮箱");
            String em = sc.next();
            String insertSQL = "insert into users(name,password,email) values(?,?,?)";
            PreparedStatement pm = conn.prepareStatement(insertSQL);//对插入sql进行处理了
            pm.setString(1,un); // 将SQL第一个？号绑定un的值
            pm.setString(2,pd); // 将SQL第二个？号绑定pd的值
            pm.setString(3,em); // 将SQL第三个？号绑定em的值
            String sql = "select * from users";
            rs = stmt.executeQuery(sql);
            //5. 显示结果集合
            System.out.println("id | name | password "+"| eamil |birthday");
            while (rs.next()){
                int id = rs.getInt("id");
                String name = rs.getNString("name");
                String psw = rs.getNString("possword");
                String email = rs.getNString("eamil");
                Date birthday = rs.getDate("birthday");
                System.out.println(id + "| " +name+ " | " +psw+"| "+ email + " | " +birthday);
            }
        }
        catch (ClassNotFoundException e){
            e.printStackTrace();
        }
        finally {
            //6.回收资源
            if (rs != null){
                try{
                    rs.close();
                }catch (SQLDataException e){
                    e.printStackTrace();
                }
                rs = null;
            }
            if (stmt != null){
                try{
                    stmt.close();
                }
                catch(SQLDataException e){
                    e.printStackTrace();
                }
                stmt = null;
            }
            if (conn != null){
                try{
                    conn.close();
                }catch(SQLDataException e){
                    e.printStackTrace();
                }
                conn = null;
            }
        }
    }
}


